Download the provided zip package from bluebridge.de you need to sideload to your MS Teams client application.
Open the MS Teams client application and - if necessary - log on with your credentials. Click on one of the channels in the respective team in the "Teams" section you want to add the BlueBridge Glossary to.
The following articles show you how to manually install (sideload) the BlueBridge Glossary for MS Teams from your client application. You can also directly add the BlueBridge Glossary for MS Teams from within the Teams Store, which will be explained here.